SANTA CLARA, Calif. — San Francisco newcomer Richard Sherman will miss the next week of training camp and the 49ers’ preseason opener after straining a hamstring in practice Friday.

“We’re definitely going to rest him at least a week,” 49ers coach Kyle Shanahan said Saturday. “We don’t think it should be long term. It’s Grade 1, it’s a little higher than we expected so we got to be careful with that.”

The former Seattle cornerback was hurt chasing down receiver Pierre Garcon after a long completion from Jimmy Garoppolo during a full-team drill. The three-time All-Pro returned to practice at the start of training camp after suffering a torn right Achilles in November with the Seahawks. Sherman signed a three-year $39.15 million deal in the off-season after being cut by Seattle.

In Sherman’s place Sunday, the 49ers rotated Tyvis Powell and Greg Mabin with the starting defence. Jimmie Ward stepped in for Sherman during the off-season program but has been withheld from full-team drills after suffering a hamstring strain last week. Ward has participated during individual portions of the last two practices.

San Francisco opens its preseason slate Thursday night at home against the Dallas Cowboys.